1. Digestive Disease Institute, Cleveland Clinic, Cleveland, Ohio.
2. Bariatric and Metabolic Institute, Cleveland Clinic, Cleveland, Ohio.
3. Fundació Clínic per la Recerca Biomèdica, Hospital Clínic of Barcelona, Universitat de Barcelona, Spain.
4. Digestive Disease Institute, Cleveland Clinic Abu Dhabi, Abu Dhabi, United Arab Emirates.